Update default settings in ExtractDialog for frame extraction: changed step value to 1 for "every frame" extraction mode and adjusted UI to reflect this preference.

hvideotool/ui/extract_dialog.py

@@ -29,7 +29,11 @@ class ExtractDialog(QDialog):
 
         self.step = QSpinBox()
         self.step.setRange(1, 100000)
-        self.step.setValue(15)
+        self.step.setValue(1)
+
+        # Default to "every frame" (every-N-th mode, step=1) — keyframes are
+        # faster but too sparse; the user usually wants every frame.
+        self.mode.setCurrentIndex(1)
 
         self.max_dim = QSpinBox()
         self.max_dim.setRange(0, 8192)